There's the underground spot at 33-70 prince off the top of my head, some recent reviews as well in the flushing review thread.
If you want to venture out of flushing
There's Broadway spa in Astoria, but I haven't kept up to date with that place for the past year; had some porn star looking milfs. And in Jamaica there is always doll house, but that place is basically a brothel, not a spa. There are a ton of non-asian Indy's that work out of private spaces, though, just not in flushing.
With the exception of dollhouse the premium you have to pay at spas for non-asian was never commensurate with the service provided. Always left feeling disappointed.
There was this Asian spa on union street that had a smoking, young Latina charging normal flushing prices.. only got to see her twice before she disappeared.. unfortunate.